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Author:Abu Bekr Mohammed ben Al Hasan Al Karhi

Abu Bekr Mohammed ben al Hasan al Karhi
(953–1029)
Persian or Arabic Muslim mathematician and engineer; his exact name is lost, along with all his original works in Arabic
Abu Bekr Mohammed ben al Hasan al Karhi

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Works by this author published before January 1, 1924 are in the public domain worldwide because the author died at least 100 years ago. Translations or editions published later may be copyrighted. Posthumous works may be copyrighted based on how long they have been published in certain countries and areas.